Sock



FIG. 1 is a front view of a sock showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a perspective view thereof. 

The ornamental design for a sock, as shown. 